JPH0245560Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a joint for segments for tunnel lining.

Problems to be solved by conventional technology and ideas Tunnels made by assembling segments can be constructed by filling the back of the segments with backfilling material, or creating water channels to drain spring water.
Efforts have been made to prevent water leakage from the segment joints, but it has been difficult to completely stop water leakage. As a result, the tunnel environment deteriorates and the road surface freezes, creating problems for vehicles.

By the way, a structure has been proposed in which a water stopper containing a resin that absorbs water and swells and gels is interposed between the thick end faces of a joint part made by abutting the thick end faces of the segments (Japanese Unexamined Patent Application Publication No. 1983-1993). −143653).

By the way, the intervening resin has the property of absorbing water without being dissolved in water, and swelling and gelling from several times to nearly 1,000 times its volume. Therefore, if a water stopper containing this dry resin is inserted between the thick end faces when assembling the segments, if spring water enters the joint after the segments are assembled, the resin will absorb water. It swells and becomes a gel, completely filling the joint gap and exhibiting water-stopping properties. However, the swollen resin may protrude into the tunnel and cause damage.

This idea was devised in view of the above circumstances.

Means to Solve the Problem This idea is to apply asphalt or polymeric resin as a binder to the resin powder, which absorbs water and swells into a gel, between the thick end faces of the joint, which is formed by abutting the thick end faces of the segments against each other. A segment joint part characterized in that a band-shaped water stopper and a band-shaped nonwoven fabric are used, the nonwoven fabric is arranged inside the segment, and the water stopper is arranged outside the nonwoven fabric. It is a structure.

Example A resin powder that absorbs water and swells is formed into a band shape using asphalt or a polymer resin as a binder between the end surfaces 2 and 2 of the joint portion where the end surfaces 2 and 2 of the segments 1 and 1 are butted together. Water stop body 3
and a band-shaped nonwoven fabric 4 are interposed between the end surfaces 2, 2 of the segments 1, 1, with the nonwoven fabric 4 disposed inside the segment, and the water stopper 3 disposed outside the nonwoven fabric 4.

Examples of the resin used in this invention that swells and gels when it absorbs water include starch-acrylonitrile or starch-methacrylate graft copolymer,
Partial hydrolysates of polyacrylonitrile and vinyl ester-ethylenically unsaturated carboxylic acid copolymers, polymers with hydrophilic groups such as sulfonated styrene, polyethylene oxide, polyvinyl alcohol, polyvinylpyrrolidone, sodium polyacrylate, polyacrylamide, Radiation-irradiated products of water-soluble polymer compounds such as carboxymethyl cellulose, polyacrylic acid/acrylamide copolymer, bullulan, crosslinked products with crosslinking agents such as methylene bisacrylamide, dichloroacetic acid, epichlorohydrin, aldehydes, and some hydrophilic groups Examples include those substituted with a lipophilic group, and copolymers of isobutylene and maleic anhydride.

These resins can be made into strips, resin powder and granules are fixed with asphalt or synthetic resin binders to make strips, or powder and granules of resin are combined with water-permeable fabric or foamed resin. and is interposed between the end faces of the segments.

Effects of the Idea When water permeates into the segment joints of this structure, the resin absorbs water, swells and becomes a gel, tightly sealing the space between the end surfaces 2 and 2, and exhibits water-stopping properties. Furthermore, since the nonwoven fabric 4 is interposed on the inside of the segment, it is possible to prevent the swollen resin from protruding inside the segment or damaging it. Therefore, this segment joint can exhibit reliable water-stopping properties with a simple configuration, and the segments can be easily assembled.

[Brief explanation of drawings]

The drawing is a cross-sectional view of a segment joint portion according to an embodiment of this invention. 1...Segment, 2...End face, 3...Water stop body, 4...Nonwoven fabric.

Claims (1)

[Scope of utility model registration request] Between the thickness end faces of the joint where the thickness end faces of the segments butt each other, a water stopper and a belt-shaped non-woven fabric are placed in the form of a band of resin powder that absorbs water and swells and becomes a gel using asphalt or polymeric resin as a binder. A joint structure for a segment, characterized in that the nonwoven fabric is disposed inside the segment, and the water stopper is disposed outside the nonwoven fabric.